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首页> 外文期刊>Applied optics >Estimations of fiber Bragg grating parameters and strain gauge factor using optical spectrum and strain distribution information
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Estimations of fiber Bragg grating parameters and strain gauge factor using optical spectrum and strain distribution information

机译：利用光谱和应变分布信息估算光纤布拉格光栅参数和应变仪系数

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摘要

An inverse approach based on an optimization technique is proposed to characterize a fiber Bragg grating(FBG) and the strain gauge factor (GF) when the FBG is bonded on a structure. By bonding an FBG on a substrate and simply straining this FBG into a chirped fiber Bragg grating with a predesignated strain, the proposed method, based on an optimization technique, can be used to reconstruct seven parameters of the FBG from the corresponding reflective spectrum. The parameters identified are the length of an FBG, the grating period, the average refractive index, the index modulation, the apodization coefficient, the starting point bonded on the plate, and the strain GF. The information from the predesignated strain, as well as the measured reflective spectrum, is used as the objective function during the optimal search. As a result, the design sensitivity for the optimal search is much improved compared with the design sensitivity when only the reflective spectrum is used. In particular, the strain GF, which depends on the adhesive, the bonding layer characteristics, etc., can be determined in order to provide a reference for an FBG used as a strain sensor. Results from numerical simulations and experiments show that seven parameters of an FBG can be obtained accurately and efficiently.
机译：提出了一种基于优化技术的逆方法来表征光纤布拉格光栅（FBG）和结构应变系数（GF）的特征。通过将FBG粘合在基板上并将该FBG简单地应变到具有预定应变的chi光纤布拉格光栅中，基于优化技术的拟议方法可用于从相应的反射光谱重建FBG的七个参数。确定的参数是FBG的长度，光栅周期，平均折射率，折射率调制，切趾系数，结合在板上的起点和应变GF。来自预定应变的信息以及测得的反射光谱被用作最佳搜索过程中的目标函数。结果，与仅使用反射光谱的设计灵敏度相比，用于最佳搜索的设计灵敏度大大提高。特别地，可以确定取决于粘合剂，粘结层特性等的应变GF，以便为用作应变传感器的FBG提供参考。数值模拟和实验结果表明，可以准确，有效地获得FBG的七个参数。

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